Evidence map›Paper›PMID 31266425›Full record

ArticleProceedings. Biological sciences2019

Local interactions and their group-level consequences in flocking jackdaws.

Hangjian Ling, Guillam E Mclvor, Kasper van der Vaart, Richard T Vaughan, Alex Thornton, Nicholas T Ouellette

Abstract read
In one paragraph

Article in Proceedings. Biological sciences, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

21 citing papers in PubMed.

  1. Article
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  7. Dynamics of collective motion across time and species.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Article
  8. A multi-scale review of the dynamics of collective behaviour: from rapid responses to ontogeny and evolution.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Review
  9. Article
  10. Article
  11. Article
  12. Article
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  15. Article
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  17. Scale-Free Dynamics in Animal Groups and Brain Networks.Frontiers in systems neuroscience · 2020
    Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Hangjian Ling1 Department of Civil and Environmental Engineering, Stanford University , Stanford, CA , USA.
Guillam E Mclvor2 Center for Ecology and Conservation, University of Exeter , Penryn , UK.
Kasper van der Vaart1 Department of Civil and Environmental Engineering, Stanford University , Stanford, CA , USA.
Richard T Vaughan3 School of Computing Science, Simon Fraser University , Burnaby , Canada.
Alex Thornton2 Center for Ecology and Conservation, University of Exeter , Penryn , UK.
Nicholas T Ouellette1 Department of Civil and Environmental Engineering, Stanford University , Stanford, CA , USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

As one of nature's most striking examples of collective behaviour, bird flocks have attracted extensive research. However, we still lack an understanding of the attractive and repulsive forces that govern interactions between individuals within flocks and how these forces influence neighbours' relative positions and ultimately determine the shape of flocks. We address these issues by analysing the three-dimensional movements of wild jackdaws ( Corvus monedula) in flocks containing 2-338 individuals. We quantify the social interaction forces in large, airborne flocks and find that these forces are highly anisotropic. The long-range attraction in the direction perpendicular to the movement direction is stronger than that along it, and the short-range repulsion is generated mainly by turning rather than changing speed. We explain this phenomenon by considering wingbeat frequency and the change in kinetic and gravitational potential energy during flight, and find that changing the direction of movement is less energetically costly than adjusting speed for birds. Furthermore, our data show that collision avoidance by turning can alter local neighbour distributions and ultimately change the group shape. Our results illustrate the macroscopic consequences of anisotropic interaction forces in bird flocks, and help to draw links between group structure, local interactions and the biophysics of animal locomotion.

Indexed as

Social BehaviorAnimalsBehavior, AnimalBiomechanical PhenomenaCrowsFlight, AnimalUnited Kingdombiophysics of locomotioncollective behaviourcorvidsflockingsocial interactionsthree-dimensional imaging

Identifiers

PMID31266425
PMCPMC6650722

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.